Pumping device.



R. I. CARTMELL.

PUNIPING DEVICE.

APPLICATION FILED APII.24, I9I6.

Patented Feb. 20, 1917.

2 SHEETS-SHEET l.

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76 www5 R. J. CRTIVIELL` PUIVPING DEVC APPLICATION man APR.

lltented Feb 20, 1917.

2 SHEETS-SHEET 2 Y l s 2 ROBERT J". CARTMELL, 0F SOAP LAKE,

WASHNGTON, ASSIGNO OF ONE-HALF TO JOHN W. KAHLE, OF SEATTLE, WASHINGTGN.

PUIVIPING DEVICE.

Specification of Letters Patent.

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Application filed April 24, 1916. Serial No. 93,084.

To all wwm it may concern:

Be it known thatI, ROBERT J. CARTMELL,

a citizen of the United States, and resident of Soap Lake, Grant a pump which is halting between strokes and at substantially uniform speed at all times. The above object is attained by the use of a special kind of pump and by operating this by means of mechanism of a special type. Other objects of my invention will appear from a study of the specifications and the claims. scope of my invention may also be determined by an examination of the claims terminating this specification.

In the accompanying drawings I have shown my invention embodied in the form of construction which is now most preferred by me.

Figure l is an elevation, partly in section, of a deep well having` therein a pump made and operated in accordance with my invention. i

Fig. 2 is an elevation taken through the pit at the upper end of the well in which the pump actuatingl mechanism is installed, the view thereof being taken from a point at right angles to Fig. 1.

Fig. 3V is a sectional elevation taken from the same view point as in Fig. 1. p

Fig. 4 is a vertical section through the upper end of the pump casing showing the discharge and the packing gland surrounding the pump rod.

Fig. 5 is a horizontal section taken on the center line of the pump discharge.

ln my pump I preferably locate the cylinder at the bottom of the well, or at least at such a point that the natural head of the water w'll cause the water to flow thereto at all times.

The cylinder 1 is provided with a foot valve 10 at the lower end thereof, or at a of thepiston 2 and point which is beyond the farthest point reached in the stroke of the piston. The piston 2 1s provided with a valve or valves 20, through which the water may pass from one side of the piston to the other. Th casing 1l is of substantially the same sectional area as the sectional area of the section 1 which constitutes the cylinder. This casing extends to the surface.

e piston or pump rod 21, is made of a cross-sectional area substantially half that j also substantially half that of the delivery pipe or casing 11 and extends at this diameter to the surface and through the packing gland 22. The length of this pipe is such that an end is at all times projected beyond the packing gland, even when the piston is at its extreme lowermost point.

In using a ed that the uniform rate from start maintained stroke and that the period of rest be as short as possible. When so operated, the following` results will be secured: On the upward movement of the piston an amount of water is drawn in through the foot valve 10 to fill the cylinder l; the amount of water discharged through the discharge pipe 12 to the top of the well will be equal to half the volume of th the casing for any unit of length, as its displacement is just half that of the same length of cylinder. This follows from the fact that the pump rod 21 is in area equal to half that of the casing or delivery pipe 11. -On the downward movement of the pump piston the water which is contained in the cylinder 1 between the piston 2 andfoot valve 10, will be forced through the valves 20 in the piston into the delivery pipe 11. As the'extra displacement produced in the casing 1l and cylinder 1 by the downward movement of the piston is only that due to the. size of the pump rod 21, and as this extra displacement is in volume one-half t at due to the travel of the piston, then a volume of water equal to half the contents of the cylinder will be forced upward and e pump e water contained inl outward through the dischargepipe 12 by lt 1s thus seen is pump, although having only a foot such downward movement. that th that the speed of travel valve anda valve in the piston, acts to produce an equal discharge upon the movement of theY piston in either direction. It thus, in eect produces constant and. continuous delivery of water, although resembling in its construction a single acting pump.

In operating this pump it is desirable ofthe piston be sufficiently high that the momentum of the column'of water in the casing will be suflicient to cause it to continue its motion to a considerable degree during the slight vpause or intervalwhich must elapse at the time of As this time isvery short, the pump may, -by operating itat the proper speed, be caused to discharge a continuous, steady stream of water, Vand that without necessity for employing an air chamber. For the most suc- Vopposite sides to engage Vof the yoke on reversal.

cessful operation of this pump, it is therefore necessaryto employ a mechanism which will secure this promptreversal and uniform rate of movement during the stroke. To this end l prefer to employ a type of mechanism which is substantially the same as that shown in Patent No'. 1,169,923, issued to me February 1, 1916. Y

This mechanism employs a yoke 3 which consists of two parallel bars joined at their ends and having rack teeth formed upon their inner. or. opposite faces and a pinion 4 which is adapted to engage one of these racks ata time and upon reaching the end cfa rack is automatically transferred to engage with the opposite rack, such mechamsm-being, in its general features a well known type lof mechanism forl converting ro- Ytary into reciprocating movement. Y In the device employed the yoke 3 is provided with lugs. 80, located at the ends thereof and outwardly ofthe side edges ofthe pinion and the pinion 41 is provided with `lugs l0 at with lugs 30 of the yoke, to .thereby shift the yoke laterally. The mechanism for operating this yoke is essentially shown in the said patent and its description in detail herein is'therefore believed to .be unnecessary.

The connection of this pump actuating mechanism with the pump rod is however slightly different from that shownr in the said patent. lThe upper end of the pump rod 21 is provided'with ahead which contains a pin 23 and the lower end of the yoke 3 .is provided with a transversely extended slot 31, which receives the pin 23. |The transverse horizontal extent of this slot is such' as to accommodate the transverse shift The slot is also placed ata slight angle to the horizontal, the direction of the angle being determined by the position occupied by the yoke when g making either stroke.

The position shown inFig. 3 is thatoccupied at the time the yoke and pump are starting the upward movement. It will be noted that the angular position of the slot 31 is such that the reciprocating movement of the yoke will tend to cause the pin 23 to slide into the end it is intended to occupy.

When the yoke reaches its uppermost position and is reversed for the downward stroke, it shifts laterally so that the pin Q3 occupies the other end of the slot 31. lt will be noted that the inclination is also such that the downward thrust of the yoke will tend' to cause movement of the pin 23 into corresponding position in the slot; in other words, the inclination of the slot is such that the slight tendency produced by lengthwise movement of the yoke will tend to draw the pin toward the position it should occupy during this movement.

rlhe upperend of the pump rod is preferably provided with guides of such character asto support it and cause it to move .in a straight line. To this end the upper cud of the pump rod is provided with a cross head 211 having arms 25, each provided with a hole fitting about a guide rod QG, which guide rod is supported at top and bottom.

To lessen the shock at the time of starting and stopping the pumpv rod, l prefery to provide the guide rods 26, at eachend with a coil spring 27, against which the cross head arms-Q5 engage at the end of the stroke. The slight compression of these springs prior to reversal will give an impetus to the yoke sufiicient to start it promptly uponithe reverse stroke, thus cutting down the time required for the reversal. To assistI the prompt lateral shifting of the lower end of the yoke 3 at the bottom limit ofits stroke, I provide a spring 5 which is so shaped and placed that it has-an inclined surface 50 at the inner side of its upper end, which constitutes a cam surface for engagement with the lower ond of the yoke 3, thus exerting upon this yoke a'lateral push whichis effective, immediately upon the removal o the downward eiiiort, to cause this end of the yoke to be shifted laterally into the desired position for the reversev stroke.

Experience has shown that in the operation of these pumps they may be given a 11E speed of travel such that the momentum of the water will be ample to continue the movement of the water column throughout the period of reversal of the pump, without causing any appreciable slackening in its l rate of movement, and also that the pump actuating mechanism described may be operated smoothlyat the speeds needed to secure this result. In the operation of the pump it is necessary to employ some mecha- 12 What I claim as my invention is: comprising a yoke frame having opposite 30 l. pump operating mechanism comprisinwardly facing racks, a rotating pinion ing a pump rod guided to reciprocate in a adapted to be engaged with either rack, fixed path, an actuating member for said rod means for laterally shifting the yoke to encomprising a yoke frame having opposite, gage its racks alternately with the pinion inwardly facing racks, a rotating pinion and a means connecting said yoke with the 35 adapted to e engaged with either rack, pump rod comprising a pin on the pump rod means for laterally shifting the yoke to enand a slot in the yoke, the slot in the yoke gage its racks alternately with the pinion, being inclined slightly from a perpendicuand a means connecting said yoke with the lar to the axis of reciprocation in a direction pump rod permitting a lateral shifting of' that the tendency for lateral movement due 40 the point of connection to correspond with to th angle corresponds with the lateral the lateral shifting of the yoke. movement given the yoke when reversed.

2. A pump operating mechanism compris- 4. The combination with a driving pinion, ing a pump rod guided to reciprocate in a a yoke having opposite inwardly facing fixed path, an actuating member for said racks adapted to be alternately engaged with 45 rod comprising a yoke frame having oppothe pinion, a driven member reciprocating site inwardly facingvracks, a rotating pinion in a fixed path7 means acting upon the yoke adapted to be engaged with either rack, adjacent the pinion to shift it laterally from means for laterally shifting the yoke to enengagement with the other, the driven memgage its racks alternately with the pinion, ber having a pin and the yoke having a 50 and a means connecting said yoke with the transversely extending slot receiving the pump rod comprising a transversely extendpin, and a spring placed to engage the yoke ing slot in one and a pin in the other, whereto laterally shift it as it reaches the lowerby a transverse shifting of the point of conmost point of itsrtravel. nection is secured. Signed at Seattle, Washington, this 11th 55 3. A pump operating mechanism comprisday of April 1916. ing a pump rod guided to reciprocate in a fixed path, an actuating member for said rod ROBERT J.v CARTMELL.

Copies of this patent may be obtained for ive cents each, by addressingrthe Commissioner of Patents, Washington, D. C. 

